I would argue 'Rex' is closer to Avestan (old Persian) Rastar than Sanskrit Rājati. (In shared words between these two Indo-Iranian languages, Sanskrit 'j' typi

I would argue 'Rex' is closer to Avestan (old Persian) Rastar than Sanskrit Rājati. (In shared words between these two Indo-Iranian languages, Sanskrit 'j' typically is 's' in Avestan.)